| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact, lightweight braking device for rolling stock, capable of holding an emergency brake for many hours during power failure and dispensing with a large number of accumulators. SOLUTION: An accumulator 6 is connected to piston side oil chambers 4A-4D of brake cylinders 1A-1D, and rod side oil chamber 5A-5D are selectively connected to an accumulator 10 or a tank 11 through solenoid selector valves 9A, 9C. Brake shoes 3A-3D are put in braking action by braking pressure (pressure of the accumulator 6) continuously led into the piston side oil chambers 4A-4D. There is therefore no hindrance to a brake even with an oil leak or the like in a circuit on the accumulator 10 side. A safety solenoid selector valve 21 and a relief valve 22 are series-interposed at a branch circuit to the tank 11 from a circuit of the accumulator 6, and at the time of power failure the safety solenoid selector valve 21 is opened to relieve braking pressure to the set pressure of the relief valve 22. A hydraulic source 16 is held in common to other hydraulic equipment. |
